You clicked the paladin, and it showed the 38%; then you clicked the hellhound and nothing happened?This was a duel. Was it vs AI or vs a human opponent?Did the rest of the game proceed as normal? Did the hellhound move around and do stuff and were you able to kill it on another turn.

I've seen this happen sometimes when your connection to the game has dropped: you can do stuff on the UI but no actions are taken.

Oh right, yeah it looks like that desync issue that happens in realms and custom games versus AI opponents.

Currently the only way to resolve this is to leave the game quickly and then go back. This acts like clicking refresh and shows you where the AI's creatures really are (instead of where they were on the previously glitched view).